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Laguna VANOS Fault Fuel Consumption

My 2004 Renault Laguna with a gasoline engine is acting up. The check engine light is on, and it's guzzling fuel. I'm getting an 'Inlet VANOS mechanics faulty' error. Could it be a camshaft solenoid valve or a power supply issue? Has anyone else dealt with this?

A 2004 Renault Laguna owner is experiencing increased fuel consumption and a check engine light, with an error indicating 'Inlet VANOS mechanics faulty.' Possible causes include a faulty camshaft solenoid valve or power supply issues. Another Laguna owner suggests checking for oil sludge and timing chain problems. The issue was resolved by replacing the VANOS solenoid and performing an engine flush, leading to improved performance.

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4 comment(s)

Laguna owner here. I had similar symptoms. Have you checked for oil sludge? It could be clogging things and messing with the variable timing. Is the timing chain okay?

Oil sludge? Interesting. I've been good about oil changes, but you never know. How did you diagnose the sludge issue? And what's the best way to check the timing chain?

I didn't diagnose it myself. I took it to a workshop, and they scoped it. It's worth doing before replacing VANOS solenoids. They will check the timing chain as well.

Good point! No point in blindly replacing parts. I'll book it in for a diagnosis. Thanks for the advice! It was the VANOS solenoid after all, plus a flush to clear out some gunk. 250€ later, and she's running smoothly again.

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RENAULT

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LAGUNA